Supplementary Financial Information - Interest and Other, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest expense on borrowings	$ (87)	$ (73)
Foreign exchange loss	(13)	(29)
Other, net	32	21
Nonoperating Income (Expense)	$ (68)	$ (81)